The High Court has refused to allow an Irishman described as "the largest facilitator of child porn in the world", to take a legal challenge against the DPP's decision not to prosecute him in Ireland.
Eric Eoin Marques, 28, from Mountjoy Square in Dublin, is alleged to be the owner and administrator of an anonymous hosting site known as Freedom Hosting.
He is wanted by US authorities to face charges relating to conspiring to distribute and advertise child abuse images and advertising and distributing child abuse material.
Mr Marques has been in custody since his arrest in August last year.
Last December, the extradition court heard the Director of Public Prosecutions had decided not to bring proceedings against Mr Marques with respect to the alleged offences.
The court heard that a detailed letter had been submitted to the DPP, in which it was indicated that Mr Marques would enter a plea of guilty were the offences to be prosecuted in this jurisdiction.
The afternoon, Mr Justice John Edwards said he had decided to refuse Mr Marques leave to challenge, by way of judicial review, the decision not to prosecute him.
Mr Justice Edwards also refused Mr Marques permission to challenge the DPP's refusal to give her reasons for not prosecuting him.
He said he would put the case back until 14 October to give Mr Marques' counsel time to consider the judgment and with a view to fixing a date for the extradition hearing itself.
The charges against Mr Marques relate to images on over 100 "anonymous websites" described as being extremely violent, graphic and depicting the rape and torture of pre-pubescent children.